Estimation of activation energy of desorption of n-hexanol from activated carbons by the TPD technique

Activated carbon and five kinds of metal-ion-substituted activated carbons, viz. Ag+-activated carbon, Cu2+-activated carbon, Fe3+-activated carbon, Ba2+-activated carbon and Ca2+-activated carbon, were prepared. A model for estimating the activation energy of desorption was established. Temperature-programmed desorption (TPD) experiments were conducted to measure the TPD curves of n-hexanol and hence estimate the activation energy for n-hexanol desorption from the various activated carbons. The results showed that the activation energies for n-hexanol desorption from the Ag+-activated carbon, the Cu2+-activated carbon and the Fell-activated carbon were higher than those from the unsubstituted activated carbon, the Ca2+-activated carbon and the Ba2+-activated carbon.